What does the man usually do on weekends

A．At midnight.
B．In the morning.
C．When the car is turned off.
D．When the neighbors, son leaves for work.

A．To present information about several Hawaiian volcanoes.
B．To explain a research project about an underwater volcano.
C．To demonstrate the latest use of underwater cables.
D．To discuss a study of ocean life near underwater Volcamoes.